Could a blown PCV line cause the symptom of no secondary boost ?

Boost pattern: 10-8-5, then falls to zero in a little under 1-second.

TIA,
:-( neil

 

1st turbo boost control is via the pre-spool actuator.
2nd turbo boost control is via the wastegate actuator.

Both soleniods are together at the top near the manifold. Check the hoses from the wastegate one. (rhs) if they are cracked, broken or popped off.

Also check the boost box on top. See if the 1-way valve still works & that the box is storing pressure

REgards

 

I vote no.

If it was completely disconnected you'd have a massive boost leak at the UIM, and since you have primary boost then that's not the case.